This randomized, double-blind trial compared the proposed biosimilar LA-EP2006 with the reference Neulasta® in women (≥18 years) receiving chemotherapy for breast cancer. Therefore patients were randomized to receive LA-EP2006 (n = 159) or the reference product (n = 157) for ≤6 cycles of (neo)-adjuvant TAC (docetaxel 75mg/m^2, doxorubicin 50 mg/m^2, and cyclophosphamide 500mg/m^2) chemotherapy. The primary end point was the duration of severe neutropenia (DSN) during Cycle 1 (defined as number of consecutive days with absolute neutrophil count <0.5 × 10^9/l). The equivalence was confirmed if 95% CIs were within a ±1 day margin. LA-EP2006 was equivalent to the reference product in DSN (difference: 0.07 days; 95% CI [-0.12, 0.26]). Further, LA-EP2006 and the reference Neulasta® showed no clinically meaningful differences regarding efficacy and safety.